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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a555f900dd33e63b0017bf3b3d5037643a5c4d480f199ba4d9001c0ec7e5f2ea' 
  AND token = '/vPupgzFDQFNBc8jXjvVNgOH3yS+DInFB4T4tQTnTXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}